Add cc::Surface ref counting.

cc/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
@@ skipping 969 matching lines @@
     "trees/swap_promise_manager_unittest.cc",
     "trees/tree_synchronizer_unittest.cc",
 
     # Surfaces test files.
     "surfaces/direct_compositor_frame_sink_unittest.cc",
     "surfaces/display_scheduler_unittest.cc",
     "surfaces/display_unittest.cc",
     "surfaces/surface_aggregator_unittest.cc",
     "surfaces/surface_factory_unittest.cc",
     "surfaces/surface_hittest_unittest.cc",
+    "surfaces/surface_manager_ref_unittest.cc",
     "surfaces/surface_manager_unittest.cc",
     "surfaces/surface_sequence_generator_unittest.cc",
     "surfaces/surface_unittest.cc",
     "surfaces/surfaces_pixeltest.cc",
 
     # Setup.
     "test/cc_test_suite.cc",
     "test/run_all_unittests.cc",
   ]
 
@@ skipping 79 matching lines @@
     "//ui/gl:test_support",
   ]
 
   # This target should not require the Chrome executable to run.
   assert_no_deps = [ "//chrome" ]
 
   data = [
     "test/data/",
   ]
 }